Today’s Wonder of the Day was inspired by Jackson from Damascus, MD. Jackson Wonders, “Why do you feel hot when it's 89 degrees but your body temperature is 98 degrees?” Thanks for WONDERing with us, Jackson!
Some people might think that those are the things that determine whether you’re cool or not. But guess what? You don’t have to live by others’ definitions of what’s cool. You can decide what’s cool for yourself.
You know what we think is cool? Kids who love to WONDER! That’s you! So if you’re visiting Wonderopolis today, you’re cool in our book.
Today, we want to take a look at how cool people are…temperature-wise. You probably already know that humans are mammals, and that means they’re warm-blooded. Warm-blooded animals are those animals whose temperatures are regulated and kept fairly constant by processes inside their bodies.
Cold-blooded animals, on the other hand, are animals whose temperature depends on the environment around them. They don’t necessarily have blood that’s actually cold. It just varies based upon the temperature of the environment around them. Some examples of cold-blooded creatures include most reptiles, fish, amphibians, and insects.
The human body works hard to maintain a relatively constant body temperature of 98.6° F. If you’ve ever been outside when it’s almost 100° F, you know that’s hot. So if you think you’re cool, you’re always hot, too…at least on the inside!
Cold-blooded animals can rely on sunlight to regulate their body temperature. But humans and other warm-blooded animals must eat more food to create their own body heat. That’s why cold-blooded animals can survive on much less food. They can also live in harsh environments that warm-blooded animals couldn’t stand.
Varying too far from 98.6° F can be very dangerous for humans. If your internal temperature drops too much, your body’s organs cannot work properly. Likewise, if your temperature gets too hot, you begin to feel very sick.
Have you ever had a fever? That’s what it’s called when your internal temperature exceeds the normal level of 98.6° F. If you’ve ever had a fever, you know how awful it feels. Usually, medicine helps return your body temperature to normal as soon as possible.
If you think about it, it’s amazing how your body maintains a normal internal temperature all the time. You could be shivering from throwing snowballs or sweating from running on the beach. But your body is working hard to maintain its temperature. Your body’s nervous system controls the work of your muscles, blood vessels, and sweat glands. These keep the inside of your body a toasty 98.6° F at all times.
As your body burns food for fuel, which it does almost constantly, heat is produced. This heat keeps your body warm. You might lower the temperature of your blood by taking a cold shower or going outside without a jacket during the winter. Then, your body responds by burning more fuel to produce more heat.
If your body cools off too quickly, you may begin to shiver. This is another way your body heats up again. As you shiver, more fuel is burned and heat is produced to warm your body.
If your blood gets too warm, your body also has ways of cooling you off. Your skin is usually always much cooler than your internal temperature. When you get too hot, your body may push more of your blood closer to your skin. There, it cools before it returns to the rest of your body.
Your skin also many sweat glands. These glands help produce sweat, which helps transfer heat and cool you off as it evaporates from your skin. Even when it’s not hot outside, your body sweats enough each day to get rid of about a quarter of the heat produced by your body! Now that’s cool!
Standards: NGSS.LS1.A, CCRA.L.3, CCRA.L.6, CCRA.R.1, CCRA.R.2, CCRA.R.4, CCRA.R.10, CCRA.SL.1